diff options
Diffstat (limited to 'drivers/media/platform/coda/coda-jpeg.c')
| -rw-r--r-- | drivers/media/platform/coda/coda-jpeg.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/media/platform/coda/coda-jpeg.c b/drivers/media/platform/coda/coda-jpeg.c index 967b0159c8b9..8fa3e353f9e2 100644 --- a/drivers/media/platform/coda/coda-jpeg.c +++ b/drivers/media/platform/coda/coda-jpeg.c @@ -14,6 +14,9 @@ #include "coda.h" +#define SOI_MARKER 0xffd8 +#define EOI_MARKER 0xffd9 + /* * Typical Huffman tables for 8-bit precision luminance and * chrominance from JPEG ITU-T.81 (ISO/IEC 10918-1) Annex K.3 @@ -174,6 +177,16 @@ int coda_jpeg_write_tables(struct coda_ctx *ctx) return 0; } +bool coda_jpeg_check_buffer(struct coda_ctx *ctx, struct vb2_buffer *vb) +{ + void *vaddr = vb2_plane_vaddr(vb, 0); + u16 soi = be16_to_cpup((__be16 *)vaddr); + u16 eoi = be16_to_cpup((__be16 *)(vaddr + + vb2_get_plane_payload(vb, 0) - 2)); + + return soi == SOI_MARKER && eoi == EOI_MARKER; +} + /* * Scale quantization table using nonlinear scaling factor * u8 qtab[64], scale [50,190] |